Failover page in Sun One Web server

Can some one please guide me so that I can set up a failover page for my application which is hosted on Sun One Web Server. It is linked with one of the virtual servers.

Most of the time, if something goes wrong, we get one of the following HTTP response codes : 401 Unauthorized. 403 Forbidden. 404 Not Found. 500 Server Error.

I tried capturing the file not found error code - 404 by making changes in obj.conf, but it didnt work. The code snippet that i used is as follows: Error fn="send-error" code="404" path="/xyz/abc/test.html"

Let me know if there is something wrong here, or some other approach is required.